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A group is a defined linked collection of atoms or a single atom within a molecular entity. (IUPAC 1997) (more) Note that a "group" is somewhat more specific or detailed than "substituent" or "ligand". "Substituents" can be composed of a collection of groups.

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Category: Analysis software
Company: CambridgeSoft
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A molecular entity is any constitutionally or isotopically distinct atom, molecule, radical, complex, conformer etc., identifiable as a separately distinguishable entity.

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A substituent is an atom or group of bonded atoms that can be considered to have replaced a hydrogen atom (or two hydrogen atoms in the special case of bivalent groups) in a ...

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A microscopic chemical event is a microscopic change involving molecular entities.

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A reaction sequence is a "suggested mechanism" that is based on incomplete experimental data. For many reactions, all mechanistic information is not available. It is not ...

композитна реакција

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A composite reaction is a chemical reaction for which the expression for the rate of disappearance of a reactant involves rate constants of more than a single elementary reaction.